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To: Gabriele Monaco , Ingo Molnar , Peter Zijlstra , Andrew Morton , Mel Gorman , linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Juri Lelli , Vincent Guittot References: <20241205083110.180134-2-gmonaco@redhat.com> <4c067b75e06aadd34eff5b60fc7c59967aa30809.camel@redhat.com> <5ba975e2-06b9-4b98-bece-d601b19a06db@efficios.com> <445b4203-940d-4817-bd45-9da757f22450@efficios.com> <481a7b7716cf4eb2d592b08558d297d343d9aa25.camel@redhat.com> Content-Language: en-US From: Mathieu Desnoyers In-Reply-To: <481a7b7716cf4eb2d592b08558d297d343d9aa25.camel@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: YQBPR0101CA0208.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:67::31) To YT2PR01MB9175.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:be::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: YT2PR01MB9175:EE_|YT3PR01MB11083:EE_ X-MS-Office365-Filtering-Correlation-Id: f80920a5-71ab-4644-dbbc-08dd1866d71b 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 Qfgfmeef 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2024-12-09 08:45, Gabriele Monaco wrote: > >> Thinking back on this, you'll want a program that does the following >> on a system with N CPUs: >> >> - Phase 1: run one thread per cpu, pinned on each cpu. Print the >>    mm_cid from each thread with the cpu number every second or so. >> >> - Exit all threads except the main thread, join them from the main >>    thread, >> >> - Phase 2: the program is now single-threaded. We'd expect the >>    mm_cid value to converge towards 0 as the periodic task clears >>    unused CIDs. >> >> So I think in phase 2 we can have an actual automated test: If after >> an order of magnitude more time than the 100ms delay between periodic >> tasks we still observe mm_cid > 0 in phase 2, then something is >> wrong. > > Been thinking about this and came up with a simple draft, I'll probably > send it as a separate patch. > > Doing this can lead to false positives: the main thread may be assigned > the mm_cid 0 and keep it till the end, in this scenario the other > threads (CPUs) would get different mm_cids and exit, the main thread > will still have 0 and pass the test regardless. > > I have an idea to make it a bit more robust: we can run threads as you > described in phase 1, stop all but one (let's say the one running on > the last core), make sure the main thread doesn't accidentally run on > the same core by pinning to core 0 and wait until we see the 2 > remaining threads holding 0 and 1, in any order. > Besides a special case if we have only 1 available core, this should > work fine, sure we could get false positives but it seems to me much > less likely. > > Does it make sense to you? A small tweak on your proposed approach: in phase 1, get each thread to publish which mm_cid they observe, and select one thread which has observed mm_cid > 1 (possibly the largest mm_cid) as the thread that will keep running in phase 2 (in addition to the main thread). All threads other than the main thread and that selected thread exit and are joined before phase 2. So you end up in phase 2 with: - main (observed any mm_cid) - selected thread (observed mm_cid > 1, possibly largest) Then after a while, the selected thread should observe a mm_cid <= 1. This test should be skipped if there are less than 3 CPUs in allowed cpumask (sched_getaffinity). Thoughts ? Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com